JPH0551137A - Paper feeding device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a paper feeding device capable of preventing the adverse effects of removing the paper feeding cassette during driving. [Structure] During paper feeding, the rotation of the motor is transmitted to the sheet feeding unit 2 by the rotating body 12, and the locking body 14 is biased in the direction opposite to the biasing direction of the biasing member 17 by the rotational force of the rotary body 12 at this time. The paper feed cassette 9 is urged to engage with the engaging portion 10 to prevent the paper feed cassette 9 from being detached during paper feed to prevent jamming, and also to rotate during paper feed. Since the paper feeding unit 2 that does not receive an unreasonable force from the paper in the paper feeding cassette 9, damage of the paper feeding unit 2 is prevented in advance, and further, the rotation body 12 is stopped when the paper feeding is not performed. By retracting the body 14 from the locking portion 10 by the urging force of the urging member 17, the attachment / detachment operation of the sheet feeding cassette 9 with respect to the main body is allowed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device used in a printing machine.

[0002]

2. Description of the Related Art Conventionally, there is a sheet feeding device in which a sheet feeding cassette is attached to a main body of a printing device such as a printer or a copying machine.

[0003]

Conventionally, during the printing operation,
Alternatively, the paper feed cassette can be removed from the main body of the printing device even during the paper feed operation. However, if the paper feed cassette is unintentionally removed during the paper feed operation, the paper feed operation is interrupted and the paper stagnates in the paper feed path. Therefore, a jam occurs at the next paper feeding. Further, if the paper feeding cassette is removed during the paper feeding operation, an unreasonable force is applied to the rotating paper feeding roller or the carrying roller from the paper in the paper feeding cassette, which may damage the paper feeding roller or the carrying roller. ..

[0004]

According to a first aspect of the present invention, there is provided a paper feed cassette which is detachably mounted on a main body having a printing mechanism built therein and holds a large number of paper sheets in a stacked state, and the paper feed cassette. To the printing mechanism, a sheet feeding section rotatably provided in a sheet feeding path, a rotating body for transmitting the rotation of a motor to the sheet feeding section, a locking section provided in the sheet feeding cassette, and the rotating body. Of a displaceable locking body that is urged toward the locking portion by the rotational force of the locking sheet in the sheet feeding direction, and a biasing member that biases the locking body in a direction opposite to the locking portion. did.

According to a second aspect of the present invention, in the first aspect, the sheet feeding section is formed by the sheet feeding roller and the conveying roller that come into contact with the sheet in the sheet feeding cassette, and the rotation for transmitting the rotation of the motor to the sheet feeding roller. I set up my body.

According to a third aspect of the present invention, in the first aspect, the sheet feeding portion is formed by the sheet feeding roller and the conveying roller that come into contact with the sheet in the sheet feeding cassette, and the rotating body that transmits the rotation of the motor to the conveying roller. Was established.

According to a fourth aspect of the present invention, in the first, second or third aspect, a concave handle is formed on the sheet feeding cassette, and a handle lid is urged in the closing direction on the opening surface of the handle so as to be displaceable. A lock mechanism is provided that is locked to the handle lid at least during the paper feeding operation.

[0008]

According to the first aspect of the invention, the rotation of the motor is transmitted to the sheet feeding portion by the rotating body at the time of feeding, and the locking body is driven in the opposite direction to the biasing direction of the biasing member by the rotating force of the rotating body at this time. Can be urged to engage with the engaging part of the paper cassette,
As a result, it is possible to prevent the paper feed cassette from being removed while the paper is being fed, and prevent the occurrence of a jam. Further, during paper feeding, the rotating paper feeding unit does not receive an excessive force from the paper in the paper feeding cassette, so that the paper feeding unit can be prevented from being damaged. Further, when the sheet is not fed while the rotating body is stopped, the paper feed cassette can be detached from the main body by retracting the locking body from the locking portion by the urging force of the urging member.

According to a second aspect of the present invention, the rotation of the motor is transmitted to the conveying roller by the rotating body, and when the sheet is conveyed by the conveying roller, the locking body is locked by the rotating force of the rotating body. It can be prohibited to remove the paper feed cassette by locking the paper feed cassette.

According to the third aspect of the present invention, the rotation of the motor is transmitted to the paper feed roller by the rotary body, and when the paper is conveyed by the paper feed roller, the locking body is engaged by the rotational force of the rotary body to engage the paper feed cassette. It is possible to prohibit the removal of the paper feed cassette by locking the paper feed cassette.

According to the fourth aspect of the present invention, the handle can be easily attached and detached by gripping the handle while the handle cover is opened, and the handle cover is opened by the lock mechanism at least during feeding. Can block the movement,
As a result, it is possible to doubly prohibit removal of the paper feed cassette from the main body during paper feed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the invention of claims 1 and 2 will be described with reference to FIGS. As shown in FIG. 2, a paper feed section 2 is provided in the paper feed path 1. The paper feeding unit 2 includes a paper feeding roller 3 and conveying rollers 4 and 5. The paper feed path 1, the paper feed roller 3, and the transport rollers 4 and 5 are provided in a main body (not shown) having a printing mechanism built therein. A paper feed cassette 9 having a bottom plate 7 capable of undulating and supporting a large number of sheets 6 in a stacked state and a spring 8 for biasing the bottom plate 7 upward is detachably attached to the main body. The paper feed roller 3 is connected to a motor (not shown).

As shown in FIG. 1, the paper feeding cassette 9 is mounted on the main body from the direction of arrow A which is orthogonal to the paper feeding direction, and a locking portion is provided on the back side of the paper feeding cassette 9. A recess 10 having an upper surface opening is formed. The transport roller 4 is fixed to a drive shaft 11, and a gear 12, which is a rotating body, is fixed to one end of the drive shaft 11. The gear 12, together with other gears (not shown), constitutes a rotation transmission mechanism 13 that transmits the rotation of the motor to the transport roller 4. A locking lever 14, which is a locking body, is rotatably fitted to the rear end of the drive shaft 11. The locking lever 14 is urged toward the recess 10 (counterclockwise) by the rotational force of the gear 12 in the paper feeding direction (counterclockwise). That is, this locking lever 1
A damper gear 15 meshed with the gear 12 is attached to the spindle 1.
6 is rotatably held, and a friction member (not shown) such as a spring washer is interposed between the locking lever 14 and the damper gear 15. Therefore, when the gear 12 rotates counterclockwise, A downward pressure is applied to 15, and the locking lever 14 is biased counterclockwise. The counterclockwise urging force is set to be stronger than the clockwise urging force of the spring 17 as the urging member.

In such a structure, when the paper is not fed,
The motor is stationary with the gear 12. In this state, the locking lever 14 is maintained in the state of being rotated clockwise by the urging force of the spring 17. In this state, the paper feed cassette 9 is attached to or detached from the main body.

At the time of sheet feeding, the sheet feeding roller 3 is rotated counterclockwise by the motor, and the rotation of the motor is transmitted to the conveying roller 4 by the rotation transmitting mechanism 13. At this time,
Since the gear 12 rotates counterclockwise, the damper gear 1
5 receives downward pressure about the support shaft 16, and since a friction member is interposed between the damper gear 15 and the locking lever 14, the damper gear 15 rotates the locking lever 14 counterclockwise. Rotate while making. As a result, the tip of the locking lever 14 engages with the recess 10 of the paper feeding cassette 9,
It is possible to prevent the occurrence of jam by prohibiting the operation of detaching the paper feed cassette 9 from the main body in the direction opposite to the arrow A direction.
Further, during the paper feeding, the rotating paper feeding roller 3 does not receive an excessive force from the paper 6 in the paper feeding cassette 9, so that the damage of the paper feeding roller 3 can be prevented in advance. Further, when the gear 12 is stopped and the paper is not fed, the locking lever 1
The paper feed cassette 9 can be removed from the main body by retracting 4 from the recess 10 by the urging force of the spring 17.

By interposing a friction member between the locking lever 14 and the gear 12, when the gear 12 rotates counterclockwise, the rotational force of the gear 12 is applied to the locking lever 14 by the friction member. The locking lever 14 can be made to follow the counterclockwise direction and locked in the recess 10 of the sheet feeding cassette 9. Even in this case, when the gear 12 is stopped, the locking lever 14 can be retracted above the recess 10 by the biasing force of the spring 17 to allow the attachment / detachment operation of the sheet feeding cassette 9. As a result, the damper gear 1
5 can be omitted.

Next, one embodiment of the invention of claim 3 is shown in FIG.
It will be explained based on. The same parts as those in the above-mentioned embodiment are designated by the same reference numerals and the description thereof is omitted (the same applies hereinafter). The paper feed roller 3 is fixed to a drive shaft 11, and the gear 1 is attached to one end of the drive shaft 11.
2 is fixed. A locking lever 14 is rotatably fitted to the rear end of the drive shaft 11. The locking lever 14 is urged toward the recess 10 (counterclockwise) by the rotational force of the gear 12 in the paper feeding direction (counterclockwise).

In such a structure, when the paper is not fed,
The motor is stationary with the gear 12. In this state, the locking lever 14 is maintained in the state of being rotated clockwise by the urging force of the spring 17. In this state, the paper feed cassette 9 is attached to or detached from the main body.

At the time of sheet feeding, the rotation of the motor is transmitted to the sheet feeding roller 3 and the conveying roller 4 by the rotation transmitting mechanism 13.
At this time, since the gear 12 rotates counterclockwise, the damper gear 15 receives downward pressure about the support shaft 16, and the damper gear 15 rotates while rotating the locking lever 14 counterclockwise. As a result, the tip of the locking lever 14 engages with the recess 10 of the paper feed cassette 9, and the operation of removing the paper feed cassette 9 from the main body in the direction opposite to the arrow A direction is prohibited. When the paper is not fed with the gear 12 stopped, the locking lever 1
The paper feed cassette 9 can be removed from the main body by retracting 4 from the recess 10 by the urging force of the spring 17.

Further, an embodiment of the invention of claim 4 is shown in FIG.
Or, it demonstrates based on FIG. A concave handle 19 that is opened and closed by a handle lid 18 is formed on the front surface of the paper feed cassette 9. The handle lid 18 is rotatably held by a support shaft 20 and is biased by a spring 21 held by the support shaft 20 in a direction of closing the opening surface of the handle 19, as shown in FIG. It is supported by a stopper 22 formed on a part of the handle 19. Further, inside the handle 19, a lock mechanism 23 that prohibits the movement of the handle lid 18 in the opening direction is provided. This lock mechanism 23
A lock lever 25 rotatably held on the support shaft 24;
A solenoid 26 to which the lock lever 25 is connected,
It is composed of a spring 27 for retracting the lock lever 25 from the inner surface of the handle lid 18. The solenoid 26 uses a paper sensor (not shown) when the rotation transmission mechanism 13 is driven, when the printing mechanism is driven, or when the paper 6 is conveyed into the paper feed path 1. ), The lock lever 25 is rotated to contact the inner surface of the handle lid 18.

In such a structure, the solenoid 26 is normally kept in a non-energized state, so that the lock lever 2
5 is retracted from the inner surface of the handle lid 18 by the urging force of the spring 27. Therefore, the handle 19 can be held while the handle lid 18 is opened. This makes it easy to attach and detach the paper feed cassette 9 to and from the main body.

Then, when the rotation transmission mechanism 13 is driven, when the printing mechanism is driven, or when the paper sensor detects that the paper 6 is being conveyed into the paper feed path 1. The solenoid 26 can rotate the lock lever 25 to bring it into contact with the inner surface of the handle lid 18 to prevent the opening operation of the handle lid 18, thereby removing the sheet feeding cassette 9 from the main body during sheet feeding. Can be banned twice.

[0023]

According to the first aspect of the present invention, a paper feed cassette that is detachably mounted on a main body having a printing mechanism built therein and holds a large number of sheets in a stacked state, and the printing mechanism from the paper feed cassette. To the sheet feeding path, a rotating body for transmitting the rotation of the motor to the sheet feeding section, a locking portion provided in the sheet feeding cassette, and a feeding direction of the rotating body. Since a displaceable locking body that is biased toward the locking portion by a rotational force to the locking portion and a biasing member that biases the locking body in a direction opposite to the locking portion, At the time of paper, the rotation of the motor is transmitted to the paper feeding section by the rotating body, and the rotational force of the rotating body at this time biases the locking body in the direction opposite to the biasing direction of the biasing member to lock the paper feed cassette. Can be locked to the paper tray, which allows you to remove the paper cassette during paper feeding. To prevent the occurrence of jams, and because the rotating paper feed section does not receive excessive force from the paper in the paper feed cassette during paper feeding, damage to the paper feed section can occur. In addition, the non-feeding state in which the rotating body is stopped can be removed from the main body by retracting the locking body from the locking portion by the urging force of the urging member. Have the effect of.

According to a second aspect of the present invention, in the first aspect, the sheet feeding section is formed by the sheet feeding roller and the conveying roller that come into contact with the sheet in the sheet feeding cassette, and the rotation for transmitting the rotation of the motor to the sheet feeding roller. Since the body is provided, the rotation of the motor is transmitted to the conveying roller by the rotating body, and when the sheet is conveyed by the conveying roller, the locking body is locked to the locking portion of the sheet feeding cassette by the rotating force of the rotating body. This has the effect of prohibiting the removal of the paper feed cassette.

According to a third aspect of the present invention, in the first aspect, the sheet feeding portion is formed by the sheet feeding roller and the conveying roller that come into contact with the sheet in the sheet feeding cassette, and the rotating body that transmits the rotation of the motor to the conveying roller. Since the rotation of the motor is transmitted to the paper feed roller by the rotating body and the paper is conveyed by the paper feed roller, the locking body is locked by the rotating force of the rotating body to the locking portion of the paper feeding cassette. This has the effect of prohibiting the removal of the paper feed cassette.

According to a fourth aspect of the present invention, in the first, second or third aspect, a concave handle is formed on the sheet feeding cassette, and a handle lid is urged in the closing direction on the opening surface of the handle so as to be displaceable. Since at least a lock mechanism is provided which is locked to the handle lid during feeding, it is possible to facilitate the attachment / detachment operation of the sheet feeding cassette by holding the handle while the handle lid is open, and at least The opening mechanism of the handle lid can be prevented by the lock mechanism during paper feeding, which has the effect that it is possible to doubly prohibit removal of the paper feeding cassette from the main body during paper feeding.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the inventions of claims 1 and 2. FIG.

FIG. 2 is a vertical sectional front view thereof.

FIG. 3 is a perspective view showing an embodiment of the invention of claim 3;

FIG. 4 is a perspective view showing an embodiment of the invention of claim 4;

FIG. 5 is a vertical sectional side view of a part thereof.

FIG. 6 is a vertical cross-sectional rear view of the line BB in FIG.

[Explanation of symbols]

 1 Paper Feeding Path 2 Paper Feeding Section 3 Paper Feeding Roller 4 Conveying Roller 6 Paper 9 Paper Feeding Cassette 10 Locking Section 12 Rotating Body 14 Locking Body 17 Biasing Member 18 Handle Lid 19 Handle 23 Locking Mechanism

Claims (4)

[Claims] 1. A paper feed cassette that is detachably mounted on a main body having a printing mechanism and holds a large number of sheets in a stacked state, and a paper feed path from the paper feeding cassette to the printing mechanism. A freely-provided sheet feeding section, a rotating body that transmits the rotation of a motor to the sheet feeding section, a locking section that is provided at the sheet feeding cassette, and a rotation force of the rotating body in the sheet feeding direction. A sheet feeding device including a displaceable locking body that is biased toward a stop portion side, and a biasing member that biases the locking body in a direction opposite to the locking portion. 2. A sheet feeding section is formed by a sheet feeding roller and a conveying roller that come into contact with a sheet in a sheet feeding cassette, and a rotating body for transmitting the rotation of a motor to the sheet feeding roller is provided. Item 1. The sheet feeding device according to item 1. 3. A sheet feeding section is formed by a sheet feeding roller and a conveying roller which come into contact with a sheet in a sheet feeding cassette, and a rotating body for transmitting the rotation of a motor to the conveying roller is provided. 1. The sheet feeding device described in 1. 4. A recessed handle is formed on a sheet feeding cassette, and a handle lid is movably provided on the opening surface of the handle by biasing it in the closing direction, and is engaged with the handle lid at least during a sheet feeding operation. 4. The sheet feeding device according to claim 1, further comprising a lock mechanism for locking the sheet.